<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>AJAX POST请求</title>
    <style>
        #result{
            width: 200px;
            height: 100px;
            border: solid 1px #903;
        }
    </style>
</head>
<body>
    <div id ="result"></div>
    <script>
        //获取元素对象
        const result =document.getElementById("result");
        //绑定事件
        result.addEventListener("mousemove",function(){
            //1.创建对象
            const xhr = new XMLHttpRequest();
            //2.初始化 设置类型与url
            xhr.open('POST','http://127.0.0.1:8000/server');
            //3.发送
            xhr.send();
            //4.事件绑定
            xhr.onreadystatechange = function(){
                //判断
                if(xhr.readyState ===4){
                    if(xhr.status>=200&&xhr.status<300){
                        //处理服务端返回的结果
                        result.innerHTML=xhr.response;
                    }
                }
            }
        });

    </script>
</body>
</html>